Just thought you should include LogInventory here - not as intuitive as Spiceworks, but a very comprehensive auditing tool nonetheless.

At the time of writing, Loginventory will scan 20 machines for free - more than enough for most home networks. I trialed both Loginventory and Spiceworks at work, and found that Loginventory was (only just), better than Spiceworks: it was faster to use, crashed less and provided more information.

However, this was some time ago now - so both products will have improved with age, one hopes. Recent tests with Spiceworks does show a distinct advantage for business users, as the built in HelpDesk solution is very capable - though not really in the Remedy or Lan Desk arena.

But for FREE, Spiceworks is very likely unbeatable.